Surface cleaning apparatus having an energy storage member and a charger for an energy storage member

ABSTRACT

A surface cleaning apparatus includes a floor cleaning unit and a portable surface cleaning unit. The floor cleaning unit includes a surface cleaning head, an upper section moveably mounted to the surface cleaning head between an upright storage position and a rearwardly inclined floor cleaning position, a charger having an energy storage member, and an air flow path extending from the dirty air inlet to a floor cleaning unit air outlet. The portable surface cleaning unit is connectable to the floor cleaning unit, and includes a portable surface cleaning unit air inlet connectable in air flow communication with the floor cleaning unit air outlet, a main body, an air treatment member, a suction motor, a handle and a capacitor. When fully charged, the energy storage member stores sufficient stored power to recharge the capacitor at least twice.

FIELD

This application relates to the field of surface cleaning apparatusoperable on an energy storage member, chargers for an energy storagemember and a surface cleaning apparatus having an on board charger foran energy storage member.

INTRODUCTION

The following is not an admission that anything discussed below is partof the prior art or part of the common general knowledge of a personskilled in the art.

Various types of surface cleaning apparatus are known, including uprightsurface cleaning apparatus, canister surface cleaning apparatus, sticksurface cleaning apparatus, central vacuum systems, and hand carriablesurface cleaning apparatus such as hand vacuums. Further, variousdesigns for cyclonic hand vacuum cleaners, including battery operatedcyclonic hand vacuum cleaners, are known in the art.

Battery operated vacuum cleaners are known. For Example, Best (U.S. Pat.No. 7,377,007) discloses an upright vacuum cleaner having a detachablevacuum module wherein the detachable vacuum module may have an on boardbattery. A charger may be provided in the surface cleaning head or thedetachable vacuum module. Accordingly, when the on board batteryrequires recharging, the on board charger may be used to recharge thebattery. Alternately, the battery charger may be provided in a dockingstation and the battery recharged when the upright vacuum cleaner isplaced in the docking station.

SUMMARY

This summary is intended to introduce the reader to the more detaileddescription that follows and not to limit or define any claimed or asyet unclaimed invention. One or more inventions may reside in anycombination or sub-combination of the elements or process stepsdisclosed in any part of this document including its claims and figures.

In accordance with a first aspect, which may be used by itself or withany one or more other aspects set out herein, an energy storage membercharger, such as a battery charger, may have its own on board energystorage member. Accordingly, when another energy storage member that isexternal to the charger (e.g., an energy storage member for a surfacecleaning apparatus) needs charging, the energy storage member in thecharger may be used to charge the energy storage member of the surfacecleaning apparatus by itself or concurrently with power drawn, e.g.,from a stationary source of power such as a household electrical outlet.The energy storage member of the energy storage member charger may holdsufficient charge to charge the external energy storage member at leasttwice and optionally 3, 4, 5, 6 or more times. Using a charger having anon board energy storage member, a user may be able to recharge an energystorage member of a surface cleaning apparatus at a rate of 2 C, 3 C, 4C, 5 C, 6 C or more.

In a particular embodiment of this aspect, the energy storage member ofthe portable surface cleaning apparatus comprises or consists of one ormore capacitors such as an ultra-capacitor.

An advantage of this design is that a user may be able to clean anentire household without any breaks or with fewer and/or shorter breaks.For example, current domestic upright or stick type vacuum cleaners mayneed 6-8 or more hours to fully recharge a battery pack. Accordingly,once a battery pack is depleted, a user may have to wait overnight tofinish cleaning a household. In contrast, in accordance with thisdesign, a surface cleaning apparatus comprises a floor cleaning moduleand a portable surface cleaning unit (e.g., a lift away module or a handvac) that has an on board energy storage member. A user may use theportable surface cleaning unit to clean part of a household (e.g.,furniture). Once that part is cleaned or when the on board energystorage member is depleted, the portable surface cleaning unit may bemounted on the floor cleaning unit. The floor cleaning unit may then beoperated on power drawn from a household electrical outlet (e.g., thesurface cleaning apparatus may have an electric cord). While the user iscleaning the floor, the energy storage member of the portable surfacecleaning unit may be recharged in, e.g., 1-15 minutes, 2-12 minutes,3-10 minutes 4-7 minutes, about 5 minutes or any desired time frame lessthan 15 minutes. Accordingly, by the time a user needs to again use theportable surface cleaning unit, the energy storage member of theportable surface cleaning unit may be fully charged. Accordingly, thisaspect allows a user to continuously use the surface cleaning apparatusin a floor cleaning and an above floor cleaning mode.

In accordance with this aspect, there is provide a surface cleaningapparatus comprising:

-   -   (a) a floor cleaning unit comprising:        -   (i) a surface cleaning head having a front end having a            dirty air inlet, a rear end and a center positioned midway            between the front and rear ends;        -   (ii) an upper section moveably mounted to the surface            cleaning head between an upright storage position and a            rearwardly inclined floor cleaning position;        -   (iii) a charger having an energy storage member; and,        -   (iv) an air flow path extending from the dirty air inlet to            a floor cleaning unit air outlet; and,    -   (b) a portable surface cleaning unit connectable to the floor        cleaning unit, the portable surface cleaning unit comprising a        portable surface cleaning unit air inlet connectable in air flow        communication with the floor cleaning unit air outlet, a main        body, an air treatment member, a suction motor, a handle and a        capacitor,    -   wherein, when fully charged, the energy storage member stores        sufficient stored power to recharge the capacitor at least        twice.

In any embodiment, the suction motor may not be operable directly onpower supplied by the energy storage member.

In any embodiment, the suction motor may be operable only from:

-   -   (a) power supplied from the capacitor, or    -   (b) the surface cleaning apparatus may further comprise an        electrical cord connectable with a stationary source of power        and the suction motor is operable from power supplied from the        capacitor and power supplied from a stationary power supply.

In any embodiment, the energy storage member may be provided in thesurface cleaning head and, optionally, in a forward portion of thesurface cleaning head (e.g., at a location forward of the portablesurface cleaning unit such as adjacent the dirty air inlet).

In any embodiment, the energy storage member may have a center ofgravity and the center of gravity may be positioned forward of thecenter of the surface cleaning head.

In any embodiment, the floor cleaning unit may further comprise athermal cooling unit thermally connected to the charger.

In any embodiment, the charger may be operable to recharge the capacitorat a rate of at least 4 C or at least 6 C.

In any embodiment, the capacitor may comprise an ultra-capacitor.

In any embodiment, the surface cleaning apparatus may further comprisean electrical cord connectable with a stationary source of power.

In any embodiment, the portable cleaning unit may further comprise anelectrical cord connectable with a stationary source of power. Theelectrical cord may be removably connectable with the portable cleaningunit.

In any embodiment, the capacitor may be removably mounted in theportable surface cleaning unit.

In any embodiment, the portable surface cleaning unit may comprise ahand vacuum cleaner and the upper section may comprise a rigid air flowconduit having an upper end and a lower end,

-   -   wherein the lower end of the rigid air flow conduit is moveably        mounted to the surface cleaning head between the upright storage        position and the rearwardly inclined floor cleaning position,        and    -   wherein the hand vacuum cleaner is connectable to the upper end        of the rigid air flow conduit,    -   whereby, when the hand vacuum cleaner is connected to the upper        end of the rigid air flow conduit the handle is a steering        handle for the vacuum cleaner.

In accordance with another aspect, which may be used by itself or withany one or more other aspects set out herein, a surface cleaningapparatus comprises a floor cleaning module and a portable surfacecleaning unit that has an on board energy storage member that optionallycomprises or consists of one or more capacitors such as anultra-capacitor. The surface cleaning head is provided with a chargerwhereby the on board energy storage member may be charged at a rate of 2C, 3 C, 4 C, 5 C, 6 C or more. As discussed previously, an advantage ofthis aspect is that a user may be able to continuously, or morecontinuously clean a household without downtime while an on board energystorage member is recharged.

In accordance with this aspect, there is provided a vacuum cleanercomprising:

-   -   (a) a floor cleaning unit comprising:        -   (i) a surface cleaning head having a front end having a            dirty air inlet, a rear end, a center positioned midway            between the front and rear ends and a charger;        -   (ii) an upper section moveably mounted to the surface            cleaning head between an upright storage position and a            rearwardly inclined floor cleaning position; and,        -   (iii) an air flow path extending from the dirty air inlet to            a floor cleaning unit air outlet; and,    -   (b) a portable surface cleaning unit removably mounted to the        upper section, the portable surface cleaning unit comprising a        main body, an air treatment member, a suction motor, a handle        and a capacitor,    -   wherein, the portable surface cleaning unit is rechargeable when        mounted to the floor cleaning unit and, wherein the capacitor is        rechargeable at a rate of at least 4 C.

In any embodiment, the suction motor may be operable only from:

-   -   (a) power supplied from the capacitor, or    -   (b) the surface cleaning apparatus may further comprise an        electrical cord connectable with a stationary source of power        and the suction motor is operable from power supplied from the        capacitor and power supplied from a stationary power supply.    -   In any embodiment, the energy storage member may have a center        of gravity and the center of gravity is positioned forward of        the center of the surface cleaning head. The center of gravity        may be positioned at the front end of the surface cleaning head.

In any embodiment, the capacitor may comprise an ultra-capacitor.

In any embodiment, the portable surface cleaning unit may comprise ahand vacuum cleaner and the upper section may comprise a rigid air flowconduit having an upper end and a lower end,

-   -   wherein the lower end of the rigid air flow conduit is moveably        mounted to the surface cleaning head between the upright storage        position and the rearwardly inclined floor cleaning position,        and    -   wherein the hand vacuum cleaner is connectable to the upper end        of the rigid air flow conduit,    -   whereby, when the hand vacuum cleaner is connected to the upper        end of the rigid air flow conduit the handle is a steering        handle for the vacuum cleaner.

In any embodiment, the portable cleaning unit may further comprise anelectrical cord connectable with a stationary source of power.

In any embodiment, the energy storage member may store sufficient storedpower to recharge the capacitor at least twice.

In any embodiment, the floor cleaning unit may further comprise athermal cooling unit thermally connected to the charger.

In accordance with this aspect, there is also provided a vacuum cleanercomprising:

-   -   (a) a floor cleaning unit comprising:        -   (i) a surface cleaning head having a front end having a            dirty air inlet, a rear end, a center positioned midway            between the front and rear ends and a charger;        -   (ii) an upper section moveably mounted to the surface            cleaning head between an upright storage position and a            rearwardly inclined floor cleaning position; and,        -   (iii) an air flow path extending from the dirty air inlet to            a floor cleaning unit air outlet; and,    -   (b) a portable surface cleaning unit removably mounted to the        upper section, the portable surface cleaning unit comprising a        main body, an air treatment member, a suction motor, a handle        and a capacitor,    -   wherein, the portable surface cleaning unit is rechargeable when        mounted to the floor cleaning unit, and    -   wherein the energy storage member has a center of gravity and        the center of gravity is positioned forward of the center of the        surface cleaning head.

In any embodiment, the suction motor may be operable only from:

-   -   (c) power supplied from the capacitor, or    -   (d) the surface cleaning apparatus may further comprise an        electrical cord connectable with a stationary source of power        and the suction motor is operable from power supplied from the        capacitor and power supplied from a stationary power supply.

In any embodiment, the center of gravity may be positioned at the frontend of the surface cleaning head.

In any embodiment, the capacitor may comprise an ultra-capacitor.

In any embodiment, the portable surface cleaning unit may comprise ahand vacuum cleaner and the upper section may comprise a rigid air flowconduit having an upper end and a lower end,

-   -   wherein the lower end of the rigid air flow conduit is moveably        mounted to the surface cleaning head between the upright storage        position and the rearwardly inclined floor cleaning position,        and    -   wherein the hand vacuum cleaner is connectable to the upper end        of the rigid air flow conduit,    -   whereby, when the hand vacuum cleaner is connected to the upper        end of the rigid air flow conduit the handle is a steering        handle for the vacuum cleaner.        In such a surface cleaning apparatus, the portable cleaning unit        may further comprise an electrical cord connectable with a        stationary source of power. The suction motor may be operable        only from:    -   (a) power supplied from the capacitor, or    -   (b) the surface cleaning apparatus may further comprise an        electrical cord connectable with a stationary source of power        and the suction motor is operable from power supplied from the        capacitor and power supplied from a stationary power supply.

In any embodiment, the energy storage member may store sufficient storedpower to recharge the capacitor at least twice or at least three times.

In any embodiment, the floor cleaning unit may further comprise athermal cooling unit thermally connected to the charger.

In accordance with another aspect, which may be used by itself or withany one or more other aspects set out herein, the charger may be remotefrom the surface cleaning apparatus. An advantage of this design is thatthe surface cleaning apparatus may be lighter. This may be preferred forthe elderly or those with a physical disability. In particular, such adesign may be used for embodiments wherein the charger includes athermal cooling member.

In accordance with this aspect, there is provided a surface cleaningapparatus kit comprising:

-   -   (a) a surface cleaning apparatus comprising:        -   (i) floor cleaning unit comprising a surface cleaning head            and a rigid air flow conduit having an upper end and a lower            end moveably mounted to the surface cleaning head between an            upright storage position and a rearwardly inclined floor            cleaning position; and,        -   (ii) a portable surface cleaning unit removably mounted to            the rigid air flow conduit, the portable surface cleaning            unit comprising a main body, an air treatment member, a            suction motor, a handle and a capacitor; and,    -   (b) a charger positionable remote from the surface cleaning        apparatus and electrically connectable to a stationary power        supply,    -   wherein, when the capacitor is electrically connected to the        charger, the capacitor is recharged at a rate of at least 4 C.

In any embodiment, the capacitor may comprise an ultra-capacitor.

In any embodiment, the charger may be operable to recharge the capacitorat a rate of at least 6 C.

In any embodiment, the surface cleaning apparatus kit may furthercomprise a thermal cooling unit thermally connected to the charger.

In any embodiment, the capacitor may be removably mounted to theportable surface cleaning unit.

In any embodiment, the portable cleaning unit may further comprise anelectrical cord connectable with a stationary source of power.

In any embodiment, the electrical cord may be removably connectable withthe portable surface cleaning unit.

In any embodiment, the portable cleaning unit may further comprise anelectrical cord connectable with the charger. The electrical cord may beremovably connectable with the portable surface cleaning unit.

In accordance with this aspect, there is also provided a surfacecleaning apparatus kit comprising:

-   -   (a) a surface cleaning apparatus comprising:        -   (i) floor cleaning unit comprising a surface cleaning head            and a rigid air flow conduit having an upper end and a lower            end moveably mounted to the surface cleaning head between an            upright storage position and a rearwardly inclined floor            cleaning position; and,        -   (ii) a portable surface cleaning unit removably mounted to            the rigid air flow conduit, the portable surface cleaning            unit comprising a main body, an air treatment member, a            suction motor, a handle and a capacitor;    -   (b) a charger positionable remote from the surface cleaning        apparatus and electrically connectable to a stationary power        supply; and,    -   (c) a thermal cooling unit thermally connected to the charger.

In any embodiment, the capacitor may comprise an ultra-capacitor.

In any embodiment, the charger may be operable to recharge the capacitorat a rate of at least 6 C.

In any embodiment, the thermal cooling unit may comprise a liquid heatsink.

In any embodiment, the capacitor may be removably mounted to theportable surface cleaning unit.

In any embodiment, the portable cleaning unit may further comprise anelectrical cord connectable with a stationary source of power. Theelectrical cord may be removably connectable with the portable surfacecleaning unit.

In any embodiment, the portable cleaning unit may further comprise anelectrical cord connectable with the charger. The electrical cord may beremovably connectable with the portable surface cleaning unit.

As discussed with respect to previous aspects, a user may be able toclean continuously or more continuously using any of the aspects set outherein. Accordingly, there is provided a method of cleaning a surfaceusing a stick vacuum cleaner, the stick vacuum cleaner comprising:

-   -   (a) a floor cleaning unit comprising:        -   (i) a surface cleaning head having a front end having a            dirty air inlet and a rear end;        -   (ii) a rigid air flow conduit having an upper end and a            lower end moveably mounted to the surface cleaning head            between an upright storage position and a rearwardly            inclined floor cleaning position; and,        -   (iii) an air flow path extending from the dirty air inlet to            a rigid air flow conduit air outlet; and,    -   (b) a hand vacuum cleaner removably mounted to the upper end of        the rigid air flow conduit, the hand vacuum cleaner comprising a        main body, an air treatment member, a suction motor, a handle        and a capacitor,    -   the method comprising:    -   (a) removing the hand vacuum cleaner from the upper end of the        rigid air flow conduit and using the portable cleaning unit to        clean a surface;    -   (b) subsequently mounting the hand vacuum cleaner on the upper        end of the rigid air flow conduit and using the stick vacuum        cleaner to clean a floor for up to 15 minutes while the        capacitor at least substantially recharges; and,    -   (c) subsequently removing the hand vacuum cleaner from the upper        end of the rigid air flow conduit and using the hand vacuum        cleaner to clean a surface.

In any embodiment, step (b) may comprise using the stick vacuum cleanerto clean the floor for up to 5, 6, 7, 8, 9, 120, 11, 12, 13, 14 or 15minutes while the capacitor substantially or fully recharges.

In any embodiment, the floor cleaning unit may further comprise acharger having an energy storage member, wherein, when fully charged,the energy storage member stores sufficient stored power to recharge thecapacitor at least twice, and step (b) may comprise using the energystorage member to recharge the capacitor.

There is also provided a method of cleaning a surface using a surfacecleaning apparatus, the surface cleaning apparatus comprising:

-   -   (a) a floor cleaning unit comprising a surface cleaning head and        a rigid air flow conduit having an upper end and a lower end        moveably mounted to the surface cleaning head between an upright        storage position and a rearwardly inclined floor cleaning        position; and,    -   (b) a portable surface cleaning unit removably mounted to the        rigid air flow conduit, the portable surface cleaning unit        comprising a main body, an air treatment member, a suction        motor, a handle and a capacitor,    -   the method comprising:    -   (a) removing the portable cleaning unit from the floor cleaning        unit and using the portable cleaning unit to clean a surface;    -   (b) subsequently mounting the portable cleaning unit on the        floor cleaning unit and using the surface cleaning apparatus to        clean a floor for up to 15 minutes while the capacitor at least        substantially recharges; and,    -   (c) subsequently removing the portable cleaning unit from the        floor cleaning unit and using the portable cleaning unit to        clean a surface.

In any embodiment, step (b) may comprise using the stick vacuum cleanerto clean the floor for up to 5, 6, 7, 8, 9, 120, 11, 12, 13, 14 or 15minutes while the capacitor substantially or fully recharges.

In any embodiment, the floor cleaning unit may further comprise acharger having an energy storage member, wherein, when fully charged,the energy storage member stores sufficient stored power to recharge thecapacitor at least twice, and step (b) may comprise using the energystorage member to recharge the capacitor.

The method may be conducted using a stick vacuum cleaner comprising:

-   -   (a) a surface cleaning head;    -   (b) a rigid air flow conduit having an upper end and a lower end        moveably mounted to the surface cleaning head between an upright        storage position and a rearwardly inclined floor cleaning        position; and,    -   (c) a hand vacuum cleaner removably mounted to the upper end of        the rigid air flow conduit, the hand vacuum cleaner comprising a        main body, an air treatment member, a suction motor, a handle, a        capacitor and an electrical cord connectable with a stationary        source of power,    -   wherein, when the portable surface cleaning unit is mounted to        the upper end of the rigid air flow conduit, the handle is a        steering handle for the vacuum cleaner.

In any embodiment, the electrical cord may be removably connectable withthe hand vacuum cleaner.

In any embodiment, the capacitor may be removably mounted to the handvacuum cleaner.

In any embodiment, the capacitor may be an ultra-capacitor.

It will be appreciated that one or more of these aspects may be usedwith outer household self-powered appliances such as power tools,kitchen appliances, personal appliances and the like.

DRAWINGS

For a better understanding of the described embodiments and to show moreclearly how they may be carried into effect, reference will now be made,by way of example, to the accompanying drawings in which:

FIG. 1 is a perspective view of a surface cleaning apparatus inaccordance with an embodiment;

FIG. 2 is an exploded view of the surface cleaning apparatus of FIG. 1;

FIG. 3 is a perspective view of a portable surface cleaning unit of thesurface cleaning apparatus of FIG. 1;

FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a perspective view of a surface cleaning apparatus inaccordance with another embodiment;

FIG. 6 is an exploded view of the surface cleaning apparatus of FIG. 5;

FIG. 7 is a side elevation view of the portable surface cleaning unit ofFIG. 3 with an energy storage member removed;

FIG. 8 is a perspective view of the energy storage member of FIG. 7 anda charger;

FIG. 9 is a schematic illustration of a surface cleaning apparatus inaccordance with an embodiment;

FIG. 10 is a perspective view of a portable surface cleaning unitconnected by a power cable to a stationary power supply, in accordancewith an embodiment;

FIG. 11 is a schematic illustration of a surface cleaning apparatus inaccordance with an embodiment;

FIG. 12 is a perspective view of a portable surface cleaning unitdisconnected from a power cable, in accordance with an embodiment;

FIG. 13 is a perspective view of a surface cleaning apparatus with afloor cleaning unit connected by a power cable to a stationary powersupply, in accordance with an embodiment;

FIG. 14 is a schematic illustration of a surface cleaning apparatus inaccordance with an embodiment;

FIG. 15 is a perspective view of a surface cleaning apparatus with afloor cleaning unit connected by a power cable to a charger, inaccordance with an embodiment;

FIG. 16 is a schematic illustration of a surface cleaning apparatus inaccordance with an embodiment;

FIG. 17 is a schematic illustration of a surface cleaning apparatus inaccordance with an embodiment;

FIGS. 18-20 are schematic illustrations of an energy storage member, athermal cooling unit, and a charger, in accordance with variousembodiments;

FIG. 21 is a flowchart illustrating a method of cleaning with a surfacecleaning apparatus, in accordance with an embodiment;

FIG. 22 is a schematic illustration of a surface cleaning apparatus inaccordance with an embodiment;

FIG. 23 is a schematic illustration of a surface cleaning apparatus inaccordance with an embodiment; and,

FIG. 24 is a schematic illustration of a surface cleaning apparatus inaccordance with an embodiment.

DESCRIPTION OF VARIOUS EMBODIMENTS

Numerous embodiments are described in this application, and arepresented for illustrative purposes only. The described embodiments arenot intended to be limiting in any sense. The invention is widelyapplicable to numerous embodiments, as is readily apparent from thedisclosure herein. Those skilled in the art will recognize that thepresent invention may be practiced with modification and alterationwithout departing from the teachings disclosed herein. Althoughparticular features of the present invention may be described withreference to one or more particular embodiments or figures, it should beunderstood that such features are not limited to usage in the one ormore particular embodiments or figures with reference to which they aredescribed.

The terms “an embodiment,” “embodiment,” “embodiments,” “theembodiment,” “the embodiments,” “one or more embodiments,” “someembodiments,” and “one embodiment” mean “one or more (but not all)embodiments of the present invention(s),” unless expressly specifiedotherwise.

The terms “including,” “comprising” and variations thereof mean“including but not limited to,” unless expressly specified otherwise. Alisting of items does not imply that any or all of the items aremutually exclusive, unless expressly specified otherwise. The terms “a,”“an” and “the” mean “one or more,” unless expressly specified otherwise.

As used herein and in the claims, two or more parts are said to be“coupled”, “connected”, “attached”, “joined”, “affixed”, or “fastened”where the parts are joined or operate together either directly orindirectly (i.e., through one or more intermediate parts), so long as alink occurs. As used herein and in the claims, two or more parts aresaid to be “directly coupled”, “directly connected”, “directlyattached”, “directly joined”, “directly affixed”, or “directly fastened”where the parts are connected in physical contact with each other. Asused herein, two or more parts are said to be “rigidly coupled”,“rigidly connected”, “rigidly attached”, “rigidly joined”, “rigidlyaffixed”, or “rigidly fastened” where the parts are coupled so as tomove as one while maintaining a constant orientation relative to eachother. None of the terms “coupled”, “connected”, “attached”, “joined”,“affixed”, and “fastened” distinguish the manner in which two or moreparts are joined together.

Further, although method steps may be described (in the disclosureand/or in the claims) in a sequential order, such methods may beconfigured to work in alternate orders. In other words, any sequence ororder of steps that may be described does not necessarily indicate arequirement that the steps be performed in that order. The steps ofmethods described herein may be performed in any order that ispractical. Further, some steps may be performed simultaneously.

Some elements herein may be identified by a part number, which iscomposed of a base number followed by an alphabetical orsubscript-numerical suffix (e.g. 112 a, or 112 ₁). Multiple elementsherein may be identified by part numbers that share a base number incommon and that differ by their suffixes (e.g. 112 ₁, 112 ₂, and 112 ₃).All elements with a common base number may be referred to collectivelyor generically using the base number without a suffix (e.g. 112).

General Description of a Hand Vacuum Cleaner

Referring to FIGS. 1-6, exemplary embodiments of a surface cleaningapparatus are shown generally as 100. The following is a generaldiscussion of apparatus 100 which provides a basis for understandingseveral of the features which are discussed herein. As discussedsubsequently, each of the features may be used individually or in anyparticular combination or sub-combination in this or in otherembodiments disclosed herein.

Surface cleaning apparatus 100 may be any type of surface cleaningapparatus, including for example a stick vacuum cleaner as shown in FIG.1, an upright vacuum cleaner as shown in FIG. 5, a canister vacuumcleaner, an extractor or a wet/dry type vacuum cleaner. Optionally, thesurface cleaning apparatus 100 may use one or more cyclones and maytherefore be a cyclonic surface cleaning apparatus.

In FIGS. 1-6, surface cleaning apparatus 100 is illustrated as includinga floor cleaning unit 104, and a portable surface cleaning unit 108 thatis connectable to the floor cleaning unit 104. The floor cleaning unit104 may include a surface cleaning head 112 adapted to clean floors.Portable surface cleaning unit 108 may include an air treatment member116. Surface cleaning apparatus 100 may include an upright configuration(also referred to as a ‘floor cleaning configuration’, see FIGS. 1 and5) in which portable surface cleaning unit 108 is mounted to floorcleaning unit 104, and dirty air that enters the surface cleaning head112 flows downstream to portable surface cleaning unit 108 where thedirty air is cleaned by air treatment member 116. Surface cleaningapparatus 100 may also include a ‘portable cleaning configuration’ (alsoreferred to as a ‘hand carriable configuration’, or ‘above-floorcleaning configuration’, see FIGS. 3 and 6), in which portable surfacecleaning unit 108 is separated from floor cleaning unit 104, such as toclean above-floor surfaces and surfaces generally inaccessible to orunsuitable for cleaning with surface cleaning head 112 for example.

In the embodiment of FIGS. 1-4, surface cleaning apparatus 100 isillustrated as a stick vacuum cleaner, which may also be referred to asa “stickvac”. As used herein and in the claims, a stick vacuum cleaneris one in which portable surface cleaning unit 108 is a hand vacuumcleaner, which may also be referred to also as a “handvac” or “hand-heldvacuum cleaner”. As used herein and in the claims, a hand vacuum cleaneris a vacuum cleaner that can be operated to clean a surface generallyone-handedly. That is, the entire weight of the hand vacuum cleaner maybe held by the same one hand used to direct a dirty air inlet of thehand vacuum cleaner with respect to a surface to be cleaned. Forexample, handle 120 and dirty air inlet 124 may be rigidly coupled toeach other (directly or indirectly), such as being integrally formed orseparately molded and then non-removably secured together such as by anadhesive or welding, so as to move as one while maintaining a constantorientation relative to each other. This is to be contrasted withcanister and upright vacuum cleaners, whose weight is typicallysupported by a surface (e.g. a floor) during use.

In the embodiment of FIGS. 5-6, surface cleaning apparatus 100 isillustrated as a convertible upright vacuum, in which portable surfacecleaning unit 108 is a ‘lift away’ pod that, in the portable cleaningconfiguration, can be hand carried by handle 120. As opposed to a handvacuum cleaner, a lift-away pod typically uses a flexible hose todeliver air for treatment to the air inlet provided in the casing of thelift-away pod. As shown, portable surface cleaning unit 108 may includea dirty air inlet 124 upstream of a flexible hose 128. For example,dirty air inlet 124 may be located at an upstream end of a rigid conduit132 (e.g. a wand). The user may manipulate rigid conduit 132 to positiondirty air inlet 124 on or adjacent a surface (e.g. above-floor surface)to be cleaned. Optionally, rigid conduit 132 may include a handle 136for the user to grasp while manipulating rigid conduit 132.

Referring again to FIGS. 1-6, floor cleaning unit 104 may includesurface cleaning head 112, an upper section 140, a dirty air inlet 144,an air outlet 148, and an air flow path 152 extending from dirty airinlet 144 to air outlet 148. As shown, surface cleaning head 112 mayinclude a front end 156 opposed to a rear end 160, opposed sides 164 and168, and a lower end 172 opposed to an upper end 176. Dirty air inlet144 may be located on lower end 172. For example, dirty air inlet 144may be provide at front end 156. Alternatively or in addition, dirty airinlet may be provided at rear end 160, or intermediate front and rearends 156, 160.

Upper section 140 may be movably mounted to surface cleaning head 112 ina manner that allows upper section 140 to move between an uprightstorage position (e.g. FIG. 1), and an inclined floor cleaning position(e.g. FIG. 5). For example, upper section 140 may have a rotatingconnection to surface cleaning head 112 that allows upper section 140 torotate between the upright storage and inclined floor cleaningpositions.

As shown in FIGS. 1-4, the portable surface cleaning unit 108 is a handvacuum cleaner and in FIGS. 5-6, the portable surface cleaning unit 108is a lift-away pod. Accordingly, the description of apparatus 100 andportable surface cleaning unit 108 below makes frequent reference tofigures showing embodiments in which portable surface cleaning unit 108is illustrated as a hand vacuum, similar to FIGS. 1-4. To be clear andconcise and avoid duplication, the description may not reference alift-way pod version which has an appearance similar to the embodimentof FIGS. 5-6. However, it is expressly contemplated, and will be readilyunderstood by persons skilled in the art, that the features describedwith reference to hand vacuum cleaners similar to the embodiment ofFIGS. 1-4 also apply mutatis mutandis to embodiments with a lift-awaypod similar to FIGS. 5-6, unless expressly stated otherwise.

Referring to FIGS. 3-4, portable surface cleaning unit 108 includes amain body 180 having an air treatment member 116 (which may bepermanently affixed to the main body or may be removable therefrom foremptying), a dirty air inlet 124, a clean air outlet 184, and an airflow path 188 extending between the dirty air inlet 124 and the cleanair outlet 184.

Portable surface cleaning unit 108 has a front end 192, a rear end 196,an upper end (also referred to as the top) 204, and a lower end (alsoreferred to as the bottom) 208. In the embodiment shown, dirty air inlet124 is at an upper portion of front end 192 and clean air outlet 184 isat rear end 196. It will be appreciated that dirty air inlet 124 andclean air outlet 184 may be positioned in different locations ofportable surface cleaning unit 108. For example, FIG. 6 illustrates anembodiment in which clean air outlet 184 is located at front end 192.

Turning to FIG. 4, portable surface cleaning unit 108 may include asuction motor 212 to generate vacuum suction through air flow path 188.Suction motor 212 may be positioned within a motor housing 216. Suctionmotor 212 may be a fan-motor assembly including an electric motor andimpeller blade(s). In the illustrated embodiment, suction motor 212 ispositioned in the air flow path 188 downstream of air treatment member116. In this configuration, suction motor 212 may be referred to as a“clean air motor”. Alternatively, suction motor 212 may be positionedupstream of air treatment member 116, and referred to as a “dirty airmotor”.

Air treatment member 116 is configured to remove particles of dirt andother debris from the air flow. In the illustrated example, airtreatment member 116 includes a cyclone assembly (also referred to as a“cyclone bin assembly”) having a single cyclonic cleaning stage with asingle cyclone 220 and a dirt collection chamber 224 (also referred toas a “dirt collection region”, “dirt collection bin”, “dirt bin”, or“dirt chamber”). Cyclone 220 has a cyclone chamber 228, a cyclone airinlet 232, and a cyclone air outlet 236. Dirt collection chamber 224 maybe external to the cyclone chamber 228 (i.e. dirt collection chamber 224may have a discrete volume from that of cyclone chamber 228). Cyclone220 and dirt collection chamber 224 may be of any configuration suitablefor separating dirt from an air stream and collecting the separated dirtrespectively and may be in communication by a dirt outlet of the cyclonechamber.

In alternate embodiments, air treatment member 116 may include a cycloneassembly having two or more cyclonic cleaning stages arranged in serieswith each other. Each cyclonic cleaning stage may include one or morecyclones arranged in parallel with each other and one or more dirtcollection chambers, of any suitable configuration. The dirt collectionchamber(s) may be external to the cyclone chambers of the cyclones.Alternatively, one or more (or all) of the dirt collection chamber(s)may be internal to one or more (or all) of the cyclone chambers. Forexample, the internal dirt collection chamber(s) may be configured as adirt collection area within the cyclone chamber.

In other embodiments, air treatment member 116 may not include acyclonic cleaning stage. For example, air treatment member 116 mayinclude a bag, a porous physical filter media (such as, for example foamor felt), one or more screens, or other air treating means.

Referring to FIG. 4, portable surface cleaning unit 108 may include apre-motor filter 240 provided in the air flow path 188 downstream of airtreatment member 116 and upstream of suction motor 212. Pre-motor filter240 may be formed from any suitable physical, porous filter media (alsoreferred to as “porous filter material”). For example, pre-motor filter240 may be one or more of a foam filter, felt filter, HEPA filter, orother physical filter media. In some embodiments, pre-motor filter 240may include an electrostatic filter, or the like. As shown, pre-motorfilter 240 may be located in a pre-motor filter housing 244 that isexternal to the air treatment member 116.

In the illustrated embodiment, dirty air inlet 124 is the inlet end 252of an air inlet conduit 248. Optionally, inlet end 252 of air inletconduit 248 can be used as a nozzle to directly clean a surface.Alternatively, or in addition to functioning as a nozzle, air inletconduit 248 may be connected (e.g. directly connected) to the downstreamend of any suitable accessory tool such as a rigid air flow conduit(e.g., an above floor cleaning wand), a crevice tool, a mini brush, andthe like. As shown, dirty air inlet 124 may be positioned forward of airtreatment member 116, although this need not be the case.

In the embodiment of FIG. 4, the air treatment member comprises acyclone 220, the air treatment air inlet is a cyclone air inlet 232, andthe air treatment member air outlet is a cyclone air outlet 236.Accordingly, when operated in the portable cleaning configuration,suction motor 212 may be activated to draw dirty air into portablesurface cleaning unit 108 through dirty air inlet 124. The dirty air isdirected along air inlet conduit 248 to the cyclone air inlet 232. Asshown, cyclone air inlet 232 may direct the dirty air flow to entercyclone chamber 228 in a tangential direction so as to promote cyclonicaction. Dirt particles and other debris may be disentrained (i.e.separated) from the dirty air flow as the dirty air flow travels fromcyclone air inlet 232 to cyclone air outlet 236. The disentrained dirtparticles and debris may discharge from cyclone chamber 228 through adirt outlet into dirt collection chamber 224 external to the cyclonechamber 228, where the dirt particles and debris may be collected andstored until dirt collection chamber 224 is emptied.

Air exiting cyclone chamber 228 may pass through an outlet passage 256located upstream of cyclone air outlet 236. Cyclone chamber outletpassage 256 may also act as a vortex finder to promote cyclonic flowwithin cyclone chamber 228. In some embodiments, cyclone outlet passage256 may include a screen 260 (also referred to as a shroud) (e.g. a finemesh screen) in the air flow path 188 to remove large dirt particles anddebris, such as hair, remaining in the exiting air flow.

From cyclone air outlet 236, the air flow may be directed into pre-motorfilter housing 244. The air flow may pass through pre-motor filter 240,and then exit pre-motor filter housing 244 into motor housing 216. Atmotor housing 216, the clean air flow may be drawn into suction motor212 and then discharged from portable surface cleaning unit 108 throughclean air outlet 184. Prior to exiting the clean air outlet 184, thetreated air may pass through a post-motor filter, which may be one ormore layers of filter media.

Referring to FIGS. 1-4, in the upright configuration (FIG. 1), dirty airinlet 124 of portable surface cleaning unit 108 is fluidly connected toair outlet 148 of floor cleaning unit 104, whereby air flow path 188 ofportable surface cleaning unit 108 is located downstream of air flowpath 152 of floor cleaning unit 104. In operation, dirty air entersdirty air inlet 144 of floor cleaning unit 104, travels along air flowpath 152 to air outlet 148, and then enters portable surface cleaningunit 108 at dirty air inlet 124. From dirty air inlet 124, the dirty airflow moves through portable surface cleaning unit 108 as described abovein connection with the portable cleaning configuration.

Referring to FIGS. 1-2, upper section 140 of floor cleaning unit 104 mayinclude a rigid air flow conduit 132. Rigid air flow conduit 132includes a conduit upper end 264 downstream of a conduit lower end 268.Conduit lower end 268 may be movably mounted to the surface cleaningapparatus between the upright storage position and the rearwardlyinclined floor cleaning position. Portable surface cleaning unit 108 maybe connected to conduit upper end 264. As shown, this allows handle 120of handvac 108 to be used as a steering handle for stickvac 100.

Fast Charging Capacitor

A trend in cordless vacuum cleaners is to provide longer runtime in asingle charge. For example, some cordless vacuum cleaners can runcontinuously for 30 minutes or more before recharging. However, suchvacuum cleaners require large, expensive, heavy batteries. In use, thiscan make these vacuum cleaners unwieldy to carry, in both size andweight. Moreover, it can take a long time to fully recharge highcapacity batteries, and batteries often degrade and require replacementduring the working life of a vacuum cleaner. The battery replacementcost is a significant expense for the user.

In some embodiments disclosed herein, a surface cleaning apparatusincludes a portable surface cleaning unit equipped with an energystorage member having one or more capacitors. As compared withrechargeable batteries (e.g. lead-acid, Ni-Cad, NiMH, or lithium), acapacitor can be recharged much faster, and have a much longer lifespan(measured in charge cycles). With battery powered vacuums, traditionaldesign philosophy is that it is important to have a long runtime tomitigate having to recharge in the middle of a cleaning session, sincethe recharge could take several hours (e.g., 4-8), which would bedisruptive to the user who wishes to finish their cleaning session in atimely manner. In contrast, with a capacitor powered portable cleaningunit, the need to recharge mid-session may be minimally disruptive as itmay only require a few seconds to a few minutes to recharge. Therefore,a capacitor powered portable surface cleaning unit may includecomparatively less energy storage capacity because avoiding a rechargemid-session is not a priority. As a result, a capacitor powered portablesurface cleaning unit may have a relatively smaller and lighter on boardenergy storage member (one or more capacitors), as compared with a highcapacity battery pack. This can make a capacitor powered portablesurface cleaning unit smaller and lighter overall, without compromisingperformance or user experience. Moreover, the long lifespan ofcapacitors (often 1 million charge cycles or more) means that thecapacitors will not generally require replacement during the workinglife of the portable surface cleaning unit.

The features in this section may be used by itself in any surfacecleaning apparatus or in any combination or sub-combination with anyother feature or features described herein.

For convenience, reference to “a capacitor” herein means “one or morecapacitors”, unless expressly stated otherwise (e.g. “a singlecapacitor”). Similarly, reference to “a battery” herein means “one ormore batteries”, unless expressly stated otherwise (e.g. “a singlebattery”).

Referring to FIG. 4, portable surface cleaning unit 108 is shownincluding an energy storage member 272. Energy storage member 272 mayinclude a capacitor 276. For example, capacitor 276 may be the onlysignificant energy storage in energy storage member 272, or energystorage member 272 may further include a battery. Some or all of thepower consuming elements of portable surface cleaning unit 108 may bepowered by capacitor 276. For example, at least suction motor 212 may bepowered by capacitor 276. In some embodiments, some or all powerconsuming elements of portable surface cleaning unit 108 may beexclusively powered by capacitor 276. For example, at least suctionmotor 212 may be exclusively powered by capacitor 276 in someembodiments.

Capacitor 276 may be any capacitor suitable for supplying power requiredto operate at least suction motor 212. For example, capacitor 276 may bean ultracapacitor (also referred to as a supercapacitor or Goldcap). Ascompared to an electrolytic capacitor, ultracapacitors have dramaticallyhigher energy density (per unit mass and per unit volume). Types ofultracapacitors include electrostatic double-layer capacitors (EDLCs),electrochemical pseudocapacitors, and hybrid capacitors that storecharge both electrostatically and electrochemically. Accordingly, itwill be appreciated that a portable surface cleaning unit 108 may useonly a single capacitor 276 or optionally, for example, 2, 3 or 4capacitors 276.

Capacitor 276 may be recharged by power from a power source external toportable surface cleaning unit 108. FIGS. 7-8 show an example in whichenergy storage member 272 is removable from portable surface cleaningunit 108 for electrically connecting to an external charger 280.External charger 280 may be powered by an electrical connection to astationary power supply 284 (e.g. mains power). An advantage of thisdesign is that the external charger 280 also reduces the size and weightof portable surface cleaning unit 108 as compared with including charger280 within portable surface cleaning unit 108. Further, this design maynot require portable surface cleaning unit 108 to have a power cord orpower cord connector, which may also reduce the size and weight ofportable surface cleaning unit 108 all else being equal. It will beappreciated that, if the capacitor is charged rapidly (e.g., 1, 2, 3, 4,or 5 minutes), then the user may be able to make a cup of coffee or makea quick call and then return to continue the cleaning operation with afuller recharged capacitor 276.

A further advantage of this design is that it can allow the user to swapa discharged energy storage member 272 for a charged energy storagemember 272 that has been stored on the charger 280.

Alternatively or in addition to energy storage member 272 beingremovable for recharging, energy storage member 272 may be rechargeablein-situ without removal from portable surface cleaning unit 108. Forexample, FIGS. 9-10 show an embodiment in which portable surfacecleaning unit 108 includes a power cable 288 for transmitting power fromstationary power supply 284 towards energy storage member 272. Anadvantage of a non-removable energy storage member 272 is that it maynot require a discrete outer shell for user handling and transportationsince it is permanently held within main body 180. Further, anon-removable energy storage member 272 may not require hardware tosupport easy user removal and insertion of energy storage member 272.This may make energy storage member 272 smaller and lighter, all elsebeing equal.

In accordance with the alternate exemplified embodiment of FIGS. 9-10,portable surface cleaning unit 108 includes charger 280 within main body180. An advantage of this design is that it may make connecting portablesurface cleaning unit 108 to a stationary power supply 284 moreconvenient, in that an external charger does not need to be relocated tothe selected stationary power supply 284.

FIG. 11 shows an alternative embodiment in which energy storage member272 is rechargeable in-situ without removal from portable surfacecleaning unit 108, by a corded connection to an external charger 280. Anadvantage of this design is that it may reduce the size and weight ofportable surface cleaning unit 108 as compared with including charger280 within portable surface cleaning unit 108, all else being equal.

In an alternate embodiment in which energy storage member 272 isrechargeable in-situ without removal from portable surface cleaning unit108, the portable surface cleaning unit 108 may itself be plugged intothe charger 280.

Energy storage member 272 may have sufficient energy capacity to powerat least suction motor 212 (or all power consuming parts of portablesurface cleaning unit 108) for at least 3 minutes (e.g. 3 minutes to 15minutes). For example, an energy storage member 272 with a capacity ofat least 5 Wh can provide 100 W of power to a suction motor 212 for atleast 3 minutes. As mentioned above, all of the energy storage may beprovided by capacitor 276 in some embodiments. A 3 to 5 minute runtimemay be sufficient for short cleaning sessions, such as to clean crumbsoff a couch, to clean dirt around a planter, or to clean cereal spilledby a child for example.

If a task is larger, and requires more runtime than energy storagemember 272 can provide, then energy storage member 272 can be quicklyrecharged. For example, charger 280 (whether external or internal toportable surface cleaning unit 108) may be configured to rechargecapacitor 276 at a rate of at least 2 C, 3 C or 4 C (e.g. at least 6 C,such as 4 C to 10 C, or 6 C to 10 C). This can allow capacitor 276 to befully recharged in a matter of seconds or minutes, as compared withhours in the case of many batteries.

Returning to FIG. 10, in some embodiments power cable 288 may bepermanently connected to portable surface cleaning unit 108. Anadvantage of this design is that it may not require portable surfacecleaning unit 108 to have hardware to support a removable connection,and it may make connecting portable surface cleaning unit 108 to astationary power supply 284 more convenient to the extent that aseparate power cable 288 does not need to be relocated to the selectedpower supply 284. FIG. 12 shows an alternative embodiment in which powercable 288 is removably connected to portable surface cleaning unit 108.For example, power cable 288 may be connected to portable surfacecleaning unit 108 only to recharge energy storage member 272. Anadvantage of this design is that it does not require the user to carrythe weight of power cable 288 when portable surface cleaning unit 108does not require a connection to a stationary power supply 284 (e.g.when not recharging).

Capacitor Rechargeable in Upright Configuration

In some embodiments, the floor cleaning unit charges the capacitor ofthe portable surface cleaning unit when the portable surface cleaningunit is connected to the floor cleaning unit. For example, the capacitorof the portable surface cleaning unit may be recharged while the surfacecleaning apparatus is operated in the upright configuration. Severaladvantages flow from this design. First, this design can mitigate thecapacitor of the portable surface cleaning unit being dead whendisconnected from the floor cleaning unit for use in the portablecleaning configuration. Second, this design can allow cleaning tocontinue in the upright configuration if the portable surface cleaningunit runs out of power in the portable surface cleaning mode. Forexample, if the capacitor of the portable surface cleaning unit runs outof power while cleaning an above-floor surface, the user may connect theportable surface cleaning unit to the floor cleaning unit and resumecleaning floor surfaces while the capacitor recharges. Third, thisdesign can allow the capacitor to recharge while the portable surfacecleaning unit is connected to the floor cleaning unit in the storagemode. This mitigates misplacing the floor cleaning unit, as compared toa design that requires the portable surface cleaning unit to bedisconnected from the floor cleaning unit to recharge.

The features in this section may be used by itself in any surfacecleaning apparatus or in any combination or sub-combination with anyother feature or features described herein.

Reference is now made to FIGS. 13-14. As shown, floor cleaning unit 104may include a charger 280. For example, charger 280 may be located insurface cleaning head 112 as shown, or in upper section 140. Whencharger 280 is connected to a source of power, and portable surfacecleaning unit 108 is connected to floor cleaning unit 104, charger 280may recharge energy storage member 272 (including at least capacitor276). In the illustrated example, portable surface cleaning unit 108 isconnected to floor cleaning unit 104 in an upright configuration. Thus,energy storage member 272 may be recharged while surface cleaningapparatus 100 is in a storage position and/or an inclined floor cleaningposition.

Embodiments that can recharge energy storage member 272 while apparatus100 is in the inclined floor cleaning position can allow the user tocontinue cleaning without interruption when portable surface cleaningunit 108 runs out of power in a portable cleaning configuration. Therapid charging rate of capacitor 276 means that capacitor 276 may befully recharged in a short period of time, and therefore allow the userto return to the portable cleaning configuration after only a short timein the upright configuration.

In some embodiments, suction motor 212 may be powered only (i.e.exclusively) by (i) energy storage member 272 (e.g. when in the portablecleaning configuration), or (ii) by a stationary power supply (e.g.mains power, when in the upright cleaning configuration). As shown, whenin the upright cleaning configuration, charger 280 may be electricallyconnected by power cable 288 to stationary power supply 284. Power cable288 may have a length suitable to allow surface cleaning apparatus 100to be used for cleaning floors in the upright configuration whileconnected to stationary power supply 284. For example, power cable 288may be at least 10-15 feet long.

Power cable 288 may be permanently connected to floor cleaning unit 104.For example, surface cleaning apparatus 100 may require an electricalconnection to a stationary power supply 284 when in the uprightconfiguration. This may encourage users to arrange their cleaningroutine to allow energy storage member 272 to recharge between shortperiods of use in the portable cleaning configuration.

Alternatively, power cable 288 may be removably connected to floorcleaning unit 104. This allows surface cleaning apparatus 100 to operatein a cordless manner while in the upright configuration, even if onlyfor a short duration subject to the power capacity of energy storagemember 272. For example, this can allow surface cleaning apparatus 100to be used in an upright configuration to clean floors (e.g. in anunfinished basement) where there is not an electrical outlet withinrange.

FIG. 15 shows an embodiment in which charger 280 is located external tofloor cleaning unit 104. This can reduce the size and weight of floorcleaning unit 104 as compared with a design having charger 280 insidefloor cleaning unit 104.

Floor Cleaning Unit Including an Energy Storage Member

In some embodiments, the floor cleaning unit may include an energystorage member. The energy storage member may have sufficient powercapacity to fully recharge the capacitor of the portable surfacecleaning unit several times. This allows a continuous cordless cleaningsession with the surface cleaning apparatus wherein the cleaning sessionincludes two or more iterations of (i) cleaning with the portablecleaning unit in the portable cleaning configuration, and (ii)recharging the portable cleaning unit while cleaning in the uprightcleaning configuration. The floor cleaning unit may include a relativelyinexpensive, rechargeable energy storage member (e.g. a lead acid,NiCad, NiMH, or lithium) with an energy storage capacity that is severaltimes greater than the capacitor of the portable surface cleaning unit.While providing a rechargeable energy storage member in the floorcleaning unit (optionally the surface cleaning head) increases theweight of the floor cleaning unit, this added weight is supported by thefloor being cleaned, and may also help stabilize the surface cleaningapparatus 100 when in the storage configuration by lowering the centerof gravity. Alternately, or in addition, it can provide needed weight tohelp maintain the dirty air inlet of the surface cleaning head a desireddistance from the floor being cleaned.

The features in this section may be used by itself in any surfacecleaning apparatus or in any combination or sub-combination with anyother feature or features described herein.

Referring to FIG. 16, floor cleaning unit 104 may include an energystorage member 292. Floor cleaning unit 104 may also include a charger280 as shown. Charger 280 may include one or more charging circuits forone or more of:

-   -   (i) supplying power from a stationary power supply (i.e. via        power cable 288) to energy storage member 292;    -   (ii) supplying power from the floor cleaning unit energy storage        member 292 to the portable surface cleaning unit energy storage        member 272; and,    -   (iii) supplying power from a stationary power supply (i.e. via        power cable 288) to energy storage member 272.

Energy storage member 292 can be any device suitable to supply power forfully recharging energy storage member 272 one or several times. Forexample, energy storage member 292 may include a battery and/or acapacitor that collectively have an energy storage capacity sufficientto recharge energy storage member 272 (or at least capacitor 276) two ormore times (e.g. three or more times, or six or more times).

In some embodiments, when portable surface cleaning unit 108 isconnected to floor cleaning unit 104, and floor cleaning unit 104 isdisconnected from an external power supply (e.g. power cable 288 isdisconnected from mains power, and/or disconnected from floor cleaningunit 104), energy storage member 272 is charged by charger 280 withpower from energy storage member 292. In this situation, surfacecleaning apparatus 100 may be operated in the inclined floor cleaningposition to clean floors while energy storage member 272 is charging.After a short period (e.g. 15 minutes or less), energy storage member272 will have been substantially or fully recharged, and portablesurface cleaning unit 108 can be removed for use again in the portablecleaning configuration.

While energy storage member 272 is being charged by charger 280 frompower supplied by energy storage member 292, suction motor 212 may bepowered exclusively by energy storage member 272. An advantage of thisdesign is that it does not require portable surface cleaning unit 108 toinclude circuitry that can electrically reconfigure suction motor 212 toreceive power directly from energy storage member 292 and/or enablesuction motor 212 to receive power directly from energy storage member292. Further, this design does not require energy storage member 292 tobe capable of discharging at a rate sufficient to supply both (i)recharging of energy storage member 272, and (ii) powering suction motor212.

Alternatively, while energy storage member 272 is being charged bycharger 280 from power supplied by energy storage member 292, suctionmotor 212 may be powered exclusively by energy storage member 292. Anadvantage of this design is that it may reduce or stop the discharge ofenergy storage member 272, so that energy storage member 272 can soonerattain a substantially or full charge for use in the portable cleaningconfiguration.

Alternatively, while energy storage member 272 is being charged bycharger 280 from power supplied by energy storage member 292, suctionmotor 212 may be powered by energy storage members 272, 292 together.

In some embodiments, when portable surface cleaning unit 108 isconnected to floor cleaning unit 104, and floor cleaning unit 104 isconnected to an external power supply (e.g. power cable 288 is connectedto mains power and floor cleaning unit 104) one or more of the followingmay occur concurrently:

-   -   (i) energy storage member 272 may be charged by charger 280 with        power from energy storage member 292 and/or power from the        external power supply;    -   (ii) energy storage member 292 may be charged by charger 280        with power from the external power supply; and,    -   (iii) suction motor 212 may be powered by energy from energy        storage member 272, and/or energy storage member 292, and/or the        external power supply.        An advantage of partially or completely powering suction motor        212 from the external power supply in this situation is that it        can reduce or stop the discharge of energy due to energy storage        members 272, 292 powering the suction motor 212 so that energy        storage members 272, 292 can sooner attain be substantially or        fully recharged. Once energy storage members 272, 292 have        attained a substantial or full charge, surface cleaning        apparatus 100 can again be used in a cordless configuration        (e.g. power cable 288 can be disconnected from mains power        and/or disconnected from floor cleaning unit 104).

Reference is now made to FIG. 17. Alternatively or in addition toproviding a charger 2801 in floor cleaning unit 104, floor cleaning unit104 may be connectable to an external charger 2802. For example,internal charger 2801 may be configured with a charging circuit fortransferring power from energy storage member 292 to energy storagemember 272, and external charger 2802 may be configured with a chargingcircuit for transferring power from an external power supply (e.g. mainspower) to energy storage member 292. This design may reduce the sizeand/or weight of floor cleaning unit 104 as compared with a design thatincludes both chargers 2801 and 2802 (or a single charger with thefunctionality of both chargers) inside floor cleaning unit 104.

Referring to FIGS. 16-17, energy storage member 292 may be locatedanywhere inside floor cleaning unit 104. For example, energy storagemember 292 may be located at (e.g. inside, part of, or attached to)surface cleaning head 112 as shown, or upper section 140. In theillustrated embodiment, surface cleaning head 112 has a center 304located midway between front and rear ends 156, 160, and energy storagemember 292 has a center of gravity 296 located forward of cleaning headcenter 304. An advantage of this design is that energy storage member292 may help move the center of gravity of surface cleaning apparatus100 forwards, and thereby help stabilize surface cleaning apparatus 100when in the storage position. For example, a more forward center ofgravity of apparatus 100 may mitigate surface cleaning apparatus tippingover rearwardly when in the storage position.

Thermal Cooling During Charging and/or Discharging

The rate at which an energy storage member can be charged, withoutsuffering damage or substantial degradation, may be limited by heatgenerated during charging. When an energy storage member for anappliance is charged, the generated heat can raise the temperature ofthe energy storage member to dangerous or damaging levels. In someembodiments, a thermal cooling unit that, directly or indirectly, coolsan appliance energy storage member during charging is provided. This canhelp keep the temperature of the energy storage member within safelimits when the energy storage member is charged rapidly (e.g. at a rateof 4 C or faster). If the charger is in a surface cleaning unit, thenthe surface cleaning apparatus may include the charger and the thermalcooling unit. Alternately, if the charger is remote, then the chargermay include the thermal cooling unit. Such a thermal cooling unit may bereferred to as an appliance energy storage member thermal cooling unit.

As discussed herein, a charger which is used to charge an energy storagemember may itself have an onboard energy storage member. The rate atwhich such an on board energy storage member can be discharged, withoutsuffering damage or substantial degradation, may also be limited by heatgenerated during discharge. When an energy storage member is rapidlydischarged, the generated heat can raise the temperature of the energystorage member to dangerous or damaging levels. In some embodiments, athermal cooling unit that, directly or indirectly, cools an chargerenergy storage member during discharging is provided. This can help keepthe temperature of the energy storage member of the charger within safelimits when the charger is rapidly charging an energy storage member(e.g. at a rate of 4 C or faster). If the charger is in a surfacecleaning unit, then the surface cleaning apparatus may include thecharger and the thermal cooling unit. Alternately, if the charger isremote, then the charger may include the thermal cooling unit. Such athermal cooling unit may be referred to as an charger energy storagemember thermal cooling unit.

It will be appreciated that, in some embodiments, the appliance energystorage member thermal cooling unit and the charger energy storagemember thermal cooling unit may be the same thermal cooling unit.

The features in this section may be used by itself in any surfacecleaning apparatus or in any combination or sub-combination with anyother feature or features described herein.

FIGS. 18-20 illustrate various embodiments of a charger 280 electricallyconnected to an energy storage member 272 or 292, and a thermal coolingunit 308 thermally connected to the energy storage member 272, 292 toremove heat generated during recharging of energy storage member 272 or292 or the discharge of energy storage member 292, and thereby keep thetemperature of the energy storage member 272, 292 within safe limitswhen the energy storage member is charged rapidly or the energy storagemember 292 is discharged rapidly.

It will be appreciated that the arrangements described herein includinga thermal cooling unit 308 can be used in combination with energystorage member 272 and/or 292 in any embodiment of surface cleaningapparatus 100, floor cleaning unit 104, or portable surface cleaningunit 108 described elsewhere or illustrated in any figure. Further, athermal cooling unit 308 may be included at a location at which theenergy storage member is used (e.g., in the portable surface cleaningunit 108) or where the energy storage member is recharged (e.g., in theportable surface cleaning unit 108 if recharged in situ or in charger280 if recharged exterior to appliance 100). For example, referring toFIGS. 22 and 23, the portable surface cleaning unit 108 may include athermal cooling unit 308 as energy storage member 272 may be rechargedin situ. Alternately, or in addition, as exemplified in FIG. 23, surfacecleaning head 112 may include a thermal cooling unit 308 to cool energystorage member 292 when energy storage member 292 is charged and/ordischarged. In the alternate embodiment exemplified in FIG. 24, energystorage member 272 is recharged external to the apparatus 100.Accordingly, remote charger 280 is provided with a thermal cooling unit308 that may be used to cool energy storage member 272 and/or 292 duringcharging and/or to cool energy storage member 292 during discharge. Itwill be appreciated that charger 280 may have a single thermal coolingunit 308 that is thermally connected to each of energy storage members272, 292 when energy storage members 272, 292 are installed in thecharger 280. Alternately, a first thermal cooling unit 308 may beprovided that is thermally connected to energy storage members 272 whenenergy storage member 272 is installed in the charger 280 and a secondthermal cooling unit 308 may be provided that is thermally connected toenergy storage members 292 when energy storage member 292 is installedin the charger 280.

Referring to FIG. 18, in some embodiments, thermal cooling unit 308 mayinclude active cooling. Any active cooling means known in the art may beused. That is, thermal cooling unit 308 may include a powered coolingelement 312. An advantage of this design is that the rate of cooling canbe controlled by regulating the power supplied to cooling element 312.This may provide better control over the temperature of energy storagemember 272, 292. Powered cooling element 312 may be any powered devicethat can be operated to remove heat from energy storage member 272, 292.For example, powered cooling element 312 may be a fan as shown, acoolant circulating pump (e.g., the energy storage member or a casing inwhich the energy storage member is received) may include flow channelsthrough which a cooling fluid may flow due to operation of the coolantcirculating pump), or a Peltier cooler. As shown, charger 280 may beconfigured to control the operation of powered cooling element 312. Forexample, charger 280 may include a temperature sensor that provides asignal to a controller that, in turn, controls the speed of fan 312according to a signal from the sensor that represents the temperature ofenergy storage member 272, 292.

Alternatively or in addition to a powered cooling element 312, thermalcooling unit 308 may include a passive cooling element 316. A passivecooling element 316 may be an unpowered device that is effective forremoving heat from energy storage member 272, 292 during charging. FIG.19 shows an example in which passive cooling element 316 is a heat sink(e.g. a metal heat sink, such as an aluminum heat sink). FIG. 20 showsan example in which passive cooling element 316 is a liquid heat sink.

In some embodiments, passive cooling element 316 may be configured toprovide an enlarged surface area to promote natural convective coolingwith the ambient air. For example, heat sink 316 in FIG. 19 includes aplurality of fins 320 that collectively provide a large surface area forconvective cooling. In use, energy storage member 272, 292 is positionedin thermal (e.g., abutting) contact with heat sink 316 whereby heat fromenergy storage member 272, 292 is transferred into heat sink 316 byconduction, and heat from heat sink 316 is lost by convection into theambient air.

Alternatively or in addition to promoting convective heat loss, passivecooling element 316 may have a heat capacity sufficient to absorb theheat generated by one or several charges of energy storage member 272,292 (e.g. at least 2 charge cycles, at least 3 charge cycles, or atleast 4 charge cycles) and/or the rapid discharge of energy storagemember 292. For example, passive cooling element 316 may include avolume of material that after absorbing one or several charges of energystorage member 272, 292, maintains the energy storage member 272, 292below a target temperature. In the exemplary embodiment of FIG. 19, heatsink 316 may be composed of a sufficient volume of metal (e.g. aluminum)to achieve this effect. In FIG. 20, thermal cooling unit 308 is shownincluding a housing 324 that holds energy storage member 272, 292 in avolume of liquid 328 (e.g. mineral oil, or other coolant). The liquid328 may have sufficient volume to maintain the temperature of energystorage member 272, 292 within safe limits after several chargingcycles.

After passive cooling element 316 has absorbed the heat generated by anumber of charge cycles, and the user has finished their cleaningsession, passive cooling element 316 will passively cool back to roomtemperature while surface cleaning apparatus 100 rests in storage (e.g.overnight). Once at room temperature, passive cooling element 316 willagain be capable of absorbing heat generated by a number of chargecycles.

In an alternate embodiment, it will be appreciated that passive coolingelement 319 may also be provided with active cooling using any techniquedisclosed herein.

Method of Cleaning with a Capacitor-Powered Portable Surface CleaningUnit

A surface cleaning apparatus operable in both upright and portablecleaning configurations, and having a portable surface cleaning unitthat may be powered by a rapidly rechargeable energy storage member(e.g. a capacitor-powered portable surface cleaning unit) may beoperated according to a new paradigm. Whereas conventional philosophyhas been that a handvac should have a maximized runtime so that allsurfaces requiring use of the handvac can be cleaned at in onecontinuous operation without recharging the handvac, embodimentsdisclosed herein promote a cleaning session that includes severaliterations of: (i) cleaning in an upright configuration while theportable surface cleaning unit charges, and (ii) cleaning in a portablecleaning configuration with the portable surface cleaning unit poweredby its, e.g., capacitor. This method of alternating between upright andportable cleaning configurations, lowers the required energy storagecapacity of the portable surface cleaning unit. This means the portablesurface cleaning unit can have a smaller, lighter, and possibly lessexpensive energy storage member. In order to achieve several fullcharges of the portable surface cleaning unit within a singleuninterrupted cleaning session, the energy storage member preferablyuses a capacitor which enables very fast charging.

It will be appreciated that, in other embodiments, a battery or batterypack that is rapidly chargeable may also be used. For example, if thehandvac may have a short run time (e.g., 3, 5, 7 or 10 minutes), thenthe handvac may have only one or a few (e.g., 2 or 3) batteries. In sucha case, the amount of energy required to fully charge the batteries isreduced compared to traditional battery packs that may have 6-7batteries. Accordingly less heat will be generated during rapidrecharging and the handvac may accordingly include a thermal coolingunit 308 that does not add excessive weight to the handvac.

The features in this section may be used by itself in any surfacecleaning apparatus or in any combination or sub-combination with anyother feature or features described herein.

Referring to FIGS. 2 and 21, a method 400 of cleaning a surface usingsurface cleaning apparatus 100 (e.g. a stickvac) is shown.

At 404, portable surface cleaning unit 108 (e.g. handvac 108) is removedfrom floor cleaning unit 104. For example, portable cleaning unit 108may be disconnected from rigid conduit upper end 264 to reconfiguresurface cleaning apparatus 100 into a portable cleaning configuration.

At 408, portable surface cleaning unit 108 is used to clean surface(s)in the portable cleaning configuration. For example, portable surfacecleaning unit 108 may be used to clean surfaces unsuitable for surfacecleaning head 112, such as seat cushions, counters, drapes, andceilings. Portable surface cleaning unit 108 may be powered by acapacitor 276 (FIG. 4).

At 412, portable surface cleaning unit 108 is remounted to floorcleaning unit 104. For example, portable cleaning unit 108 may bereconnected to rigid conduit upper end 264 to reconfigure surfacecleaning apparatus 100 into an upright configuration.

At 416, surface cleaning apparatus 100 is used in the uprightconfiguration to clean a floor, simultaneously while portable surfacecleaning unit 108 recharges. Capacitor 276 (FIG. 4) may be recharged byan internal or external charger 280 with power from an external powersupply and/or another energy storage member 292, as described above inconnection with FIGS. 9-17. Cleaning and recharging in step 416 maycontinue for a period sufficient to substantially or fully rechargecapacitor 276 (FIG. 4). For example, step 416 may continue for up to 15minutes or for up to 10 minutes or for up to 5 minutes or for up to 3minutes, during which capacitor 276 (FIG. 4) may be substantiallyrecharged or fully recharged.

As shown, after step 416, method 400 may return to step 404 and continueuntil the cleaning session is completed. Accordingly, a user may removethe portable cleaning unit 108 and use it in the portable cleaning unitconfiguration until portable cleaning unit 108 requires recharging oruntil the cleaning job is finished.

While the above description provides examples of the embodiments, itwill be appreciated that some features and/or functions of the describedembodiments are susceptible to modification without departing from thespirit and principles of operation of the described embodiments.Accordingly, what has been described above has been intended to beillustrative of the invention and non-limiting and it will be understoodby persons skilled in the art that other variants and modifications maybe made without departing from the scope of the invention as defined inthe claims appended hereto. The scope of the claims should not belimited by the preferred embodiments and examples, but should be giventhe broadest interpretation consistent with the description as a whole.

1. A surface cleaning apparatus comprising: (a) a floor cleaning unitcomprising: (i) a surface cleaning head having a front end having adirty air inlet, a rear end and a center positioned midway between thefront and rear ends; (ii) an upper section moveably mounted to thesurface cleaning head between an upright storage position and arearwardly inclined floor cleaning position; (iii) a charger having anenergy storage member; and, (iv) an air flow path extending from thedirty air inlet to a floor cleaning unit air outlet; and, (b) a portablesurface cleaning unit connectable to the floor cleaning unit, theportable surface cleaning unit comprising a portable surface cleaningunit air inlet connectable in air flow communication with the floorcleaning unit air outlet, a main body, an air treatment member, asuction motor, a handle and a capacitor, wherein, when fully charged,the energy storage member stores sufficient stored power to recharge thecapacitor at least twice.
 2. The surface cleaning apparatus of claim 1wherein the suction motor is not operable directly on power supplied bythe energy storage member.
 3. The surface cleaning apparatus of claim 1wherein the suction motor is operable only from: (a) power supplied fromthe capacitor, or (b) the surface cleaning apparatus further comprisesan electrical cord connectable with a stationary source of power and thesuction motor is operable from power supplied from the capacitor andpower supplied from a stationary power supply.
 4. The surface cleaningapparatus of claim 1 wherein the energy storage member is provided inthe surface cleaning head.
 5. The surface cleaning apparatus of claim 4wherein the energy storage member has a center of gravity and the centerof gravity is positioned forward of the center of the surface cleaninghead.
 6. The surface cleaning apparatus of claim 1 wherein the floorcleaning unit further comprises a thermal cooling unit thermallyconnected to the charger.
 7. The surface cleaning apparatus of claim 6wherein the charger is operable to recharge the capacitor at a rate ofat least 4 C.
 8. The surface cleaning apparatus of claim 6 wherein thecharger is operable to recharge the capacitor at a rate of at least 6 C.9. The surface cleaning apparatus of claim 1 wherein the capacitorcomprises an ultra-capacitor.
 10. The surface cleaning apparatus ofclaim 1 further comprising an electrical cord connectable with astationary source of power.
 11. The surface cleaning apparatus of claim1 wherein the portable cleaning unit further comprises an electricalcord connectable with a stationary source of power.
 12. The surfacecleaning apparatus of claim 11 wherein the electrical cord is removablyconnectable with the portable cleaning unit.
 13. The surface cleaningapparatus of claim 1 wherein the capacitor is removably mounted in theportable surface cleaning unit.
 14. The surface cleaning apparatus ofclaim 1 wherein the portable surface cleaning unit comprises a handvacuum cleaner and the upper section comprises a rigid air flow conduithaving an upper end and a lower end, wherein the lower end of the rigidair flow conduit is moveably mounted to the surface cleaning headbetween the upright storage position and the rearwardly inclined floorcleaning position, and wherein the hand vacuum cleaner is connectable tothe upper end of the rigid air flow conduit, whereby, when the handvacuum cleaner is connected to the upper end of the rigid air flowconduit the handle is a steering handle for the vacuum cleaner.
 15. Thesurface cleaning apparatus of claim 14 wherein the portable cleaningunit further comprises an electrical cord connectable with a stationarysource of power.
 16. The surface cleaning apparatus of claim 15 whereinthe suction motor is operable only from: (a) power supplied from thecapacitor, or (b) the surface cleaning apparatus further comprises anelectrical cord connectable with a stationary source of power and thesuction motor is operable from power supplied from the capacitor andpower supplied from a stationary power supply.
 17. The surface cleaningapparatus of claim 14 wherein the energy storage member is provided inthe surface cleaning head.
 18. The surface cleaning apparatus of claim17 wherein the energy storage member has a center of gravity and thecenter of gravity is positioned forward of the center of the surfacecleaning head.
 19. The surface cleaning apparatus of claim 1 wherein thecharger is operable to recharge the capacitor at a rate of at least 4 C.20. The surface cleaning apparatus of claim 1 wherein the energy storagemember stores sufficient stored power to recharge the capacitor at leastthree times.